/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.cloud.pubsublite.flink.internal.reader;

import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.Multimap;
import org.apache.flink.connector.base.source.reader.RecordsWithSplitIds;

public class ReaderUtils {
  public static <T> Multimap<String, T> recordWithSplitsToMap(RecordsWithSplitIds<T> records) {
    ImmutableListMultimap.Builder<String, T> builder = ImmutableListMultimap.builder();
    for (String split = records.nextSplit(); split != null; split = records.nextSplit()) {
      for (T m = records.nextRecordFromSplit(); m != null; m = records.nextRecordFromSplit()) {
        builder.put(split, m);
      }
    }
    return builder.build();
  }
}
